<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout"> 退出</el-button>
    </el-header>
    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#ffd04b" unique-opened :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单模板区 -->
              <template slot="title">
                <!-- 图标 -->
                <i :class="iconsObj[item.id]"></i>
                <!-- 文本 -->
                <span>{{item.authName}}</span>
              </template>
              <!-- 二级菜单 -->
              <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavStatus('/'+subItem.path)">
                <template slot="title">
                  <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [{
        authName: '用户管理',
        children: [{
          authName: '用户列表',
          children: [],
          id: 11,
          order: 1,
          path: 'users'
        }],
        id: 1,
        order: 1,
        path: 'users'
      },
      {
        authName: '权限管理',
        children: [{
          authName: '角色列表',
          children: [],
          id: 21,
          order: 1,
          path: 'users'
        },
        {
          authName: '权限列表',
          children: [],
          id: 22,
          order: 2,
          path: 'users'
        }],
        id: 2,
        order: 2,
        path: 'users'
      },
      {
        authName: '商品管理',
        children: [{
          authName: '商品列表',
          children: [],
          id: 31,
          order: 1,
          path: 'users'
        },
        {
          authName: '分类参数',
          children: [],
          id: 32,
          order: 2,
          path: 'users'
        },
        {
          authName: '商品分类',
          children: [],
          id: 33,
          order: 3,
          path: 'users'
        }],
        id: 3,
        order: 3,
        path: 'users'
      },
      {
        authName: '订单列表',
        children: [{
          authName: '订单统计',
          children: [],
          id: 41,
          order: 1,
          path: 'users'
        }],
        id: 4,
        order: 4,
        path: 'users'
      },
      {
        authName: '数据列表',
        children: [{
          authName: '数据统计',
          children: [],
          id: 51,
          order: 1,
          path: 'users'
        }],
        id: 5,
        order: 5,
        path: 'users'
      }],
      iconsObj: {
        1: 'iconfont icon-user',
        2: 'iconfont icon-tijikongjian',
        3: 'iconfont icon-3702mima',
        4: 'iconfont icon-danju',
        5: 'iconfont icon-baobiao'
      },
      // 默认不折叠
      isCollapse: false,
      // 被激活的连接地址
      activePath: ''
    }
  },
  // 生命周期函数，加载后立即触发
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList () {
      // 获取所有的菜单列表
      const { data: res } = await this.$http.get('menu')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.menuList = res.data
      console.log(res)
    },
    // 点击按钮，切换菜单按钮的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存二级菜单的激活状态
    saveNavStatus (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  padding: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
